Its definitely been released for a little while. You should be able to get it with no problems
Maybe try taking out your sim card and checking through WI-FI only. Maybe that could help things. Android Nougat 7.1.1 is awesome
I'm on Verizon and my 6p still has not gotten the OTA 7.1.1. I'm still on 7.0 December security update. I've even tried enrolling in the beta and checking for the update and I get nothing. Very odd.